#include<stdio.h>
void judge(char a)
{
    if (a >= 'A' && a <= 'Z' || a <= 'z' && a >= 'a')
        printf("%c is an alphabet.\n", a);
    else
        printf("%c is not an alphabet.\n", a);
}
int main()
{
    char a[100];
    int i = -1;
    do
    {
        i++;
        scanf_s("%c\n", &a[i]);
        int c = getchar();
        printf("\n");

    } while (a[i] != EOF);
    for (int k = 0; k < i; k++)
      judge(a[k]);

    return 0;
}